Safety-catch for elevators.



W. J. WEBB. SAFETY CATCH FOR ELEVATORS.

' APPLICATION FILED DEC. 26, 1913. 1,126,598. Patented Jan. 26, 1915.

2 SHEETS-SHEET 1.

THE NORRIS PETERS C0" PHOTO-LITHO. WASHINOION. D. C

W. J. WEBB.

SAFETY CATCH FOR ELEVATORS.

APPLIGATION FILED D20. 26, 1913.

Patented Jan. 26, 1915.

2 SHEETS-SHEET 2.

THE NORRIS PETERS c0. PHDTO-LITHOH WASHINGION D. c

WILLIAM J. WEBB, OF EAST AKRON, OHIO.

SAFETY-CATCH FOR ELEVATORS.

Specification of Letters Patent.

Patented Jan. 26, 1915.

Application filed December 26, 1913. Serial No. 808,762.

To all whom it may concern Be it lmown that I, WILLIAM WEBB, citizen of the United States, residing at East Akron, in the county of Summit and State of Ohio, have invented certain new and useful Improvements in Safety-Catches for Elevators, of which the following is a specification.

This invention relates to safety catches for elevators and particularly to that type thereof employing eccentrics which under danger conditions grip the sides of the guide rails on which the car travels. Catches controlling the eccentrics may be released by a governor mechanism controlled by the speed, or by a foot device operated by the elevator conductor.

The object of the invention is to provide an improved gripping device, and improved latch mechanism for controlling the operation thereof.

In the accompanying drawingsFigure 1 is a sectional view of the car and latch mechanism. Fig. 2 is a plan view'with the latches in normal or engaged position. Fig. 3 is a detail in side elevation. Fig. 4 is a view similar to Fig. 2, with the latches released. Fig. 5 is an elevation with the eccentrics in released position with respect to the guide rail, and Fig. 6 is a similar view with the eccentrics engaged.

Referring specifically to the drawings, 6 indicates the bottom of the car under which by a suitable depending frame are carried a pair of cross shafts 8 which project beyond the car to opposite sides of the guide rails 7 on which the car travels up and down. Each of these shafts 8 is provided with coiled springs 9 connected thereto and to the frame of the car, and at each end of each shaft is an eccentric 13 located in position to grip wedge-shaped projections 14 on the sides of the rails 7 The springs 9 tend to turn the shafts to throw the eccentrics into contact with said projections 14.

One shaft 8 has an arm 11 which may be engaged under a latch projection 16 on the other shaft 8, and the latter has an arm 10 which extends into position to be engaged by a hook or latch 15* projecting from a rock shaft 17 supported by a hanger 18 under the car floor. This shaft 17 is connected by a lever 15 to the shaft 20 of a governor, said shaft being operated by the balls 12 of an ordinary centrifugal governor which is driven by gearing 21 from a shaft 22 carrying a pulley 23 in contact with the controlling rope 24. The governor is supported by a hanger 25 under the car. The shaft 15 also-projects under the lower end of a treadle rod 19 which extends up through the floor of the car in position to be depressed by the foot of the conductor.

Normally the latches 15 and 16 being engaged hold the shafts 8 in position, against the tension of the springs 9, so that the eccentrics 13 will pass the projections 14 on the guide rails. Excessive speed will operate the governor, pressing down the shaft 20 against the lever 15, and swinging out the latch 15 to release the arm 10, permitting the shaft 8 to turn and release the latch '16 and the arm 11, whereupon the springs cause the shafts to turn and the eccentrics 13 to grip the inclined projections 14: on the guide rails, thereby stopping the car and locking the same. The incline of the projections 14 is preferably long so that the stop is grad,- ual. The same result can be effected by the operator pressing down on the rod 19 to release the latches.

What I claim as new is:

1. The combination with an elevator car and side rail, of a pair of spring-actuated shafts mounted on the car and having eccentrics thereon adapted to grip the rail therebetween, an arm projecting from each of the shafts, a latch on one shaft engaging the arm of the other shaft, to prevent turning of the latter, and a releasable latch mount ed on the car and engaging the other arm to prevent turning of its shaft.

2. The combination with an elevator car and side rail, of a pair of shafts mounted on the .car and having eccentrics thereon adapted to grip the rail therebetween, springs connected to the shafts and tending to turn the same to engage the eccentrics with the rail, an arm. 11 on one shaft, a latch 16 on the other shaft, engaging said arm, an arm 10 on the last mentioned shaft, a latch 15 engaging said arm 10, and means to release said latch 15 In testimony whereof, I do aflix my signature in presence of two witnesses.

WILLIAM J. WEBB.

lVitnesses:

JOHN A. BOMMHARDT, JOHN B. DAVIS.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

Washington, D. C." C 

